<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>体验vw和vh</title>
  <style>
    * {
      margin: 0;
      padding: 0;
    }
    /* vw(相对视口宽/100) 和 vh(相对视口高/100) 是相对视口宽高计算结果, 可以直接实现移动端适配效果 */
    /* .box {
      width: 50vw;
      height: 30vw;
      background-color: pink;
    } */
    .box {
      width: 50vh;
      height: 30vh;
      background-color: green;
    }
  </style>
</head>
<body>
  <div class="box"></div>
</body>
</html>